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The design for a 1/8 -hp, two-pole, 115-V universal motor gives the effective resistances of the armature and series field as 4 % and 6 %, respectively. The output torque is 0.17 N-m when the motor is drawing rated current of 1.5 A (rms) at a power factor of 0.88 at rated speed. Find:
a. The full-load efficiency.
b. The rated speed.
c. The full-load copper losses.
d. The combined windage, friction, and iron losses.
e. The motor speed when the rms current is 0.5 A, neglecting phase differences and saturation.
An FH-BPSK signal modulated with 6kbps data has a spectrum bandwidth of 20 MHz. the BPSK signal is filtered allowing only two spectral components on either side of the carrier find the maximum number of hopping frequencies.
The maximum demand charge is $30 per kVA per annum, and the energy charge per kWh is 4 cents.
Suppose that we need to combine (in series or in parallel) an unknown inductance L with a second inductance of 4H to attain an equivalent inductance of 7H. Should L be laced in series or in parallel with the original inductance? What value is req..
Let f(a,b) = b' + a. (a) Derive the truth table for f. (b) What is the canonical sum-of-products expression for f? Do not use the shorthand notation. (c) Prove by Boolean algebra that the original expression is the same as the canonical SOP expres..
Find the change in resistance of an electrical resistance strain gauge with a gauge factor of 2.0 and a resistance of 100 Ω when subject to a strain of 0.001.
suppose a fair coin is tossed n times. each coin toss costs d dollars and the reward in obtaining x heads is ax2 bx.
Determine mathematical expressions for current iL and the voltage vL following the closing of the switch.- Repeat part (a) if the switch is opened at t = 1 ms.
I started writing a program and need help. I need to be able to enter up to 15 numbers and output the minimum number, maximum number and the geometric mean.
Group and phase velocity in uniaxial crystals: a. Derive an expression for the group velocity of the extraordinary wave in a uniaxial crystal as a function of the polar angle of the propagation vector.
Is there evidence of a significant difference between the mean impulses for the two rackets at the 5% significance level?
High-fidelity audio has a maximum frequency of 22 kHz. If 20 bits are used to encode the quantized signal, what bandwidth is needed as a minimum for the digital signal?
Two loads are in parallel with a 1.2kV sinusoidal source. Load 1absorbs 60 kVAR at 0.6 leading power factor. Load 2 draws 90 kW at0.707 lagging power factor. A) How would i find the complex power in polar form
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